syntax: Remove trailing whitespace.

Found by 'make syntax-check'.
(cherry picked from commit 2cac8d490e)

.tx/config

@@ -10,4 +10,3 @@ source_lang = en
 file_filter = po-docs/<lang>.po
 source_file = po-docs/libguestfs-docs.pot
 source_lang = en
-

contrib/intro/talk.txt

@@ -159,4 +159,3 @@ screenshots shown.  But many people will simply want to mount
 a filesystem on the host using guestmount, and then use
 ordinary tools.  At the bottom is a screenshot of GNOME
 Nautilus browsing into a guest filesystem.
-

examples/guestfs-testing.pod

@@ -302,4 +302,3 @@ Richard W.M. Jones (C<rjones at redhat dot com>)
 =head1 COPYRIGHT
 
 Copyright (C) 2011-2012 Red Hat Inc.
-

generator/generator_c.ml

@@ -507,7 +507,7 @@ extern GUESTFS_DLL_PUBLIC void *guestfs_next_private (guestfs_h *g, const char *
    * guestfs_protocol.h (which includes much unrelated and
    * XDR-dependent stuff that we don't want to be public, or required
    * by clients).
-   * 
+   *
    * To reiterate, we will pass these structures to and from the client
    * with a simple assignment or memcpy, so the format must be
    * identical to what rpcgen / the RFC defines.

generator/generator_types.ml

@@ -23,14 +23,14 @@
 type style = ret * args * optargs
     (* The [style] is a tuple which describes the return value and
      * arguments of a function.
-     * 
+     *
      * [ret] is the return value, one of the [R*] values below.
-     * 
+     *
      * The second element is the list of required arguments, a list of
      * [argt]s from the list below, eg. [Bool], [String] etc.  Each has
      * a name so that for example [Int "foo"] corresponds in the C
      * bindings to an [int foo] parameter.
-     * 
+     *
      * The third element is the list of optional arguments.  These are
      * mapped to optional arguments in the language binding, eg. in
      * Perl to:

generator/generator_utils.ml

@@ -47,7 +47,7 @@ let string_of_errcode = function
  * avoid having the UUID change every time we rebuild the tests,
  * generate it as a function of the contents of the
  * generator_actions.ml file.
- * 
+ *
  * Originally I thought uuidgen was using RFC 4122, but it doesn't
  * appear to.
  *

ruby/examples/guestfs-ruby.pod

@@ -52,4 +52,3 @@ Richard W.M. Jones (C<rjones at redhat dot com>)
 =head1 COPYRIGHT
 
 Copyright (C) 2010-2012 Red Hat Inc.
-